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Restructuring (Restructuring Charges and Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at beginning of period | $ 11.8 |  | $ 9.7 | $ 13.3
Provision | 10.9 |  | 12.0 | 11.7
Cash expenditures | (12.3) |  | (9.9) | (14.7)
Non-cash Items/ Currency Change | (1.1) |  | 0.0 | (0.6)
Balance at end of period | 9.3 |  | 11.8 | 9.7
Employee termination costs |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at beginning of period | 10.7 |  | 7.9 | 12.0
Provision | 8.5 |  | 10.9 | 8.3
Cash expenditures | (11.1) |  | (8.1) | (12.1)
Non-cash Items/ Currency Change | 0.0 |  | 0.0 | (0.3)
Balance at end of period | $ 8.1 | [1] | 10.7 | 7.9
Period over which restructuring and related costs are to be paid | 12 months |  |  |
Termination of lease agreements |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at beginning of period | $ 0.6 |  | 1.8 | 0.8
Provision | 1.5 |  | 0.5 | 3.2
Cash expenditures | (0.7) |  | (1.7) | (2.0)
Non-cash Items/ Currency Change | (0.4) |  | 0.0 | (0.2)
Balance at end of period | $ 1.0 | [2] | 0.6 | 1.8
Period over which restructuring and related costs are to be paid | 12 months |  |  |
Other |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at beginning of period | $ 0.5 |  | 0.0 | 0.5
Provision | 0.9 |  | 0.6 | 0.2
Cash expenditures | (0.5) |  | (0.1) | (0.6)
Non-cash Items/ Currency Change | (0.7) |  | 0.0 | (0.1)
Balance at end of period | $ 0.2 | [3] | $ 0.5 | $ 0.0
Period over which restructuring and related costs are to be paid | 12 months |  |  |
[1] | (1) We expect the remaining $8.1 million employee termination costs to be substantially paid within the next twelve months.
[2] | (2) We expect the remaining $1.0 million termination of lease costs to be substantially paid within the next twelve months.
[3] | (3) We expect the remaining $0.2 million of other costs to be substantially paid in the next twelve months.

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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